CN116279967B - Adjustable-impedance flexible drag-reduction noise-reduction skin based on multilayer variable-stiffness units - Google Patents
Adjustable-impedance flexible drag-reduction noise-reduction skin based on multilayer variable-stiffness units Download PDFInfo
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- CN116279967B CN116279967B CN202310332508.0A CN202310332508A CN116279967B CN 116279967 B CN116279967 B CN 116279967B CN 202310332508 A CN202310332508 A CN 202310332508A CN 116279967 B CN116279967 B CN 116279967B
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- 230000009467 reduction Effects 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000013016 damping Methods 0.000 claims description 12
- 229920000620 organic polymer Polymers 0.000 claims description 7
- 239000002861 polymer material Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 abstract description 14
- 238000011161 development Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
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- 230000015572 biosynthetic process Effects 0.000 abstract description 5
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- 239000000463 material Substances 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009182 swimming Effects 0.000 description 2
- 241001125840 Coryphaenidae Species 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- 235000001968 nicotinic acid Nutrition 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/13—Hulls built to withstand hydrostatic pressure when fully submerged, e.g. submarine hulls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention belongs to the technical field of drag-reducing noise-reducing skins, and particularly relates to an impedance-adjustable flexible drag-reducing noise-reducing skin based on a multi-layer variable stiffness unit. According to the invention, a plurality of multi-layer variable stiffness units are periodically arranged along the flow direction and the expanding direction to form a multi-layer variable stiffness structure, and the multi-layer variable stiffness structure is connected with an inner elastic substrate, an outer elastic substrate and a skin to form the impedance-adjustable flexible drag-reduction noise-reduction skin. The skin can realize the adjustment of impedance under the action of the hydraulic system in the cabin, so that the submarine can obtain better drag reduction and noise reduction effects under the conditions of different water depths and navigational speeds. When the movement speed or depth of the submarine is changed, the pulse excitation size, frequency and the like of adjacent flow fields are changed, and the excitation is transmitted to the multilayer variable stiffness unit through the outer flexible skin; in turn, the overall dynamic response of the skin acts on the turbulence coherent structure of the adjacent flow field through the outer flexible skin to control the formation and development processes of the structure, so that the fluid resistance and the flow excitation noise level of the submarine are regulated and controlled.
Description
Technical Field
The invention belongs to the technical field of drag-reducing noise-reducing skins, and particularly relates to an impedance-adjustable flexible drag-reducing noise-reducing skin based on a multi-layer variable stiffness unit.
Background
With the rapid development of science and technology, higher requirements are put forward on the rapidity, endurance and stealth characteristics of the submarine, so that how to improve the drag reduction and noise reduction performances of the submarine becomes a research hotspot in the fields of ship construction and drag reduction and noise reduction at present. The hydrodynamic resistance, the flow excitation noise and the acoustic (sound insulation/absorption) characteristics of the submarine are all related to the impedance characteristics of the surface covering layer of the submarine during the navigation process. Research shows that with the change of the submergence depth (pressure) and the navigational speed, the resistance, noise and acoustic characteristics of the surface covering layer of the submergence vehicle can also change, and the resistance, noise and noise reduction performance is obviously reduced with the increase of the navigational speed. With the continuous development of bionics, researchers find that high-speed swimming marine organisms such as dolphins can realize excellent drag reduction and noise reduction effects under different swimming speeds through the regulation and control of the skin mechanical properties of the marine organisms.
The multi-layer rigidity-changing unit is inspired by a honeycomb structure, has excellent buffering vibration isolation and sound insulation effects, and can change rigidity and damping characteristics through self deformation. In addition, the structure has a plurality of adjustable parameters in the aspect of design, different structure and material parameters can be selected according to specific use environments, and the structure has better adaptability and diversity to the environments, so that the functions of vibration isolation and the like can be better realized.
Disclosure of Invention
The invention aims to provide an impedance-adjustable flexible drag-reduction noise-reduction skin based on a multi-layer variable stiffness unit.
An adjustable-impedance flexible drag-reduction noise-reduction skin based on a multi-layer variable-stiffness unit comprises an inner flexible substrate, an adjustable-impedance flexible structure and an outer flexible skin; the adjustable impedance flexible structure is formed by a multi-layer variable stiffness unit array arranged between an inner flexible substrate and an outer flexible skin, and the adjustable impedance flexible structure is fixedly connected with the inner flexible substrate and the outer flexible skin; the inner flexible substrate is provided with a through hole and is connected with a hydraulic system to realize the impedance regulation function; the outer flexible skin is not in communication with an external flow field.
Further, the multi-layer variable stiffness unit array is formed by arranging multi-layer variable stiffness units, each multi-layer variable stiffness unit comprises three layers of honeycomb structures, and the honeycomb structures of the layers are fixedly connected by adopting a cold bonding technology; the top and the bottom of the multilayer variable stiffness unit are respectively fixed on the lower surface of the outer flexible surface skin and the upper surface of the inner flexible substrate through a cold bonding technology.
Further, the inner flexible substrate and the outer flexible skin are made of flexible, light and thin organic polymer materials.
Further, the three layers of honeycomb structures forming the multi-layer variable stiffness unit are different in structural dimension.
Further, the multi-layer variable stiffness unit is made of an organic polymer material with elastic damping characteristics.
The invention has the beneficial effects that:
according to the invention, a plurality of multi-layer variable stiffness units are periodically arranged along the flow direction and the expanding direction to form a multi-layer variable stiffness structure, and the multi-layer variable stiffness structure is connected with an inner elastic substrate, an outer elastic substrate and a skin to form the impedance-adjustable flexible drag-reduction noise-reduction skin. The skin can realize the adjustment of impedance under the action of the hydraulic system in the cabin, so that the submarine can obtain better drag reduction and noise reduction effects under the conditions of different water depths and navigational speeds. When the movement speed or depth of the submarine is changed, the pulse excitation size, frequency and the like of adjacent flow fields are changed, and the excitation is transmitted to the multilayer variable stiffness unit through the outer flexible skin; in turn, the overall dynamic response of the skin acts on the turbulence coherent structure of the adjacent flow field through the outer flexible skin to control the formation and development processes of the structure, so that the fluid resistance and the flow excitation noise level of the submarine are regulated and controlled. The skin structure can adjust rigidity and damping through the adjustment of a hydraulic system, so that the impedance characteristic of the skin structure is changed, the formation and development of turbulence are affected, and good resistance and noise reduction effects are always kept. In addition, the skin structure has a plurality of adjustable parameters in the aspect of design, the number of layers of the variable stiffness unit and related parameters can be designed and adjusted in a targeted manner according to actual requirements, and the skin structure is simple in structure and easy to manufacture.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the single multi-layer variable stiffness unit structure of fig. 1.
Fig. 3 is a schematic diagram of a hydraulic system of the present invention.
FIG. 4 is a schematic representation of drag reduction characteristics of the present invention.
Fig. 5 is a schematic diagram of noise reduction characteristics of the present invention.
The reference numerals in the figures illustrate:
1. an inner flexible substrate; 2. a through hole; 3. a multi-layer variable stiffness unit; 4. an outer flexible skin; 5. a lower honeycomb structure; 6. a middle layer honeycomb structure; 7. an upper honeycomb structure; 8. a hydraulic system; 9. impedance-adjustable flexible drag-reducing noise-reducing skin based on multi-layer variable stiffness units; 10. a submarine shell; 11. turbulence excitation; 12. internal noise; 13. external noise.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides an adjustable-impedance flexible drag-reduction noise-reduction skin based on a multi-layer variable-stiffness unit. The skin can realize the adjustment of impedance under the action of the hydraulic system in the cabin, so that the submarine can obtain better drag reduction and noise reduction effects under the conditions of different water depths and navigational speeds. The inner flexible substrate and the outer flexible surface are arranged to form an array type variable stiffness layer by a plurality of multi-layer variable stiffness units according to a certain rule, and the multi-layer variable stiffness units are fixedly connected with the inner flexible substrate and the outer flexible surface. The adjustable-impedance flexible skin is laid on the surface of the submarine, the rigidity and the damping of the submarine can be changed through the adjustment of a hydraulic system under the conditions of different navigational speeds and water depths, and the impedance characteristic of the skin is adjusted, so that the submarine is suitable for different flow field environments, and good drag reduction and noise reduction effects can be ensured when the flow field speed and the pressure change.
As shown in fig. 1, the adjustable-impedance flexible drag-reduction noise-reduction skin based on the multi-layer variable-stiffness unit comprises an inner flexible substrate 1, the multi-layer variable-stiffness unit 3 and an outer flexible skin 4. The inner flexible substrate 1 and the outer flexible surface skin 4 are filled by a plurality of multi-layer variable stiffness units 3 in an array, the multi-layer variable stiffness units 3 are respectively and fixedly connected with the inner flexible substrate 1 and the outer flexible surface skin 4, so that an adjustable-impedance flexible drag-reduction noise-reduction skin based on the multi-layer variable stiffness units is formed, and the adjustable-impedance flexible drag-reduction noise-reduction skin is connected with a hydraulic system 8 in a cabin by virtue of the through holes 2, so that an impedance regulation function is realized. In addition, the skin is not communicated with an external flow field, and the liquid filling and discharging processes inside the skin are realized by connecting the skin with a hydraulic system in a cabin.
With reference to fig. 1 and 2, for typical low, medium and high characteristic navigational speeds, the invention selects three layers of honeycomb structures to form a multi-layer variable stiffness unit 3, and the structural dimensions of all layers are different from each other. The top and bottom of the multi-layer variable stiffness unit 3 are fixed to the lower surface of the outer flexible skin 4 and the upper surface of the inner flexible substrate 1, respectively, by cold bonding techniques. All layers of honeycomb structures are fixedly connected by adopting a cold bonding technology.
Further, the inner flexible substrate 1 and the outer flexible skin 4 are both made of organic polymer materials. The material of the multi-layer rigidity-changing unit 3 is an organic polymer material with elastic damping property.
Specifically, the inner flexible substrate 1 and the outer flexible skin 4 are made of polyurethane materials with characteristics of flexibility and light and thin texture. Polyurethane materials are adopted in the three-layer honeycomb structure.
Principle of operation
The function of the hydraulic system of the present invention will be described with reference to fig. 3. The adjustable-impedance flexible drag-reduction noise-reduction skin 9 based on the multi-layer variable-stiffness unit is attached to the outer surface of the submarine shell 10 through the inner flexible substrate 1. The outer surface of the skin is of a closed structure, when the submarine is not submerged, water is supplied from a water cabin in the submarine, and the inside of the skin is filled with water. The hydraulic system 8 of the present invention has two modes of operation, namely charging and discharging. When the navigational speed or the navigational depth of the submarine is changed, according to the optimal impedance condition required by skin drag reduction and noise reduction under the navigational speed of the characteristic flow field, the hydraulic system 8 is used for regulating and controlling the water in the water tank to flow into or flow out of the skin structure so as to expand or shrink the skin, thereby regulating and controlling the deformation of each layer of honeycomb structure in the multi-layer rigidity-changing unit 3, changing the rigidity and damping of the skin, controlling the impedance characteristic of the skin and further ensuring good drag reduction and noise reduction effects.
Drag reducing characteristics of the present invention are described in connection with fig. 4. The adjustable-impedance flexible drag-reduction noise-reduction skin 9 based on the multi-layer variable-stiffness unit is attached to the outer surface of the submarine shell 10 through the inner flexible substrate 1. When the navigational speed or the water pressure of the submarine is changed, the turbulence excitation 11 is changed, and the skin can change the rigidity and the damping under the adjustment of the hydraulic system 8, so that the impedance characteristic of the skin is changed, the submarine is suitable for different turbulence environments, the inhibition effect on turbulence at various navigational speeds and water pressures is ensured, and the good drag reduction effect is always kept.
The noise reduction characteristics of the present invention are described with reference to fig. 5. The adjustable-impedance flexible drag-reduction noise-reduction skin 9 based on the multi-layer variable-stiffness unit is attached to the outer surface of the submarine shell 10 through the inner flexible substrate 1. When the submarine is moved under different navigational speeds and water pressures, the skin has rigidity and damping adjustability under the action of the hydraulic system 8, the impedance characteristic of the skin can be adjusted, and the submarine is suitable for different external environments, so that noise generated by structural vibration caused by turbulent excitation 11 can be effectively reduced under various navigational speeds and water pressures. The skin weakens the energy transfer of the turbulent excitation 11 by utilizing a multi-layer variable stiffness structure, so that external noise (active sonar) 13 can be effectively restrained; in addition, the sound insulation characteristics of the internal noise (mechanical noise, etc.) 12 can be adjusted by adjusting the skin impedance characteristics by the hydraulic system 8.
According to the invention, a plurality of multi-layer variable stiffness units are periodically arranged along the flow direction and the expanding direction to form a multi-layer variable stiffness structure, and the multi-layer variable stiffness structure is connected with an inner elastic substrate, an outer elastic substrate and a skin to form the impedance-adjustable flexible drag-reduction noise-reduction skin. The skin can realize the adjustment of impedance under the action of the hydraulic system in the cabin, so that the submarine can obtain better drag reduction and noise reduction effects under the conditions of different water depths and navigational speeds. When the movement speed or depth of the submarine is changed, the pulse excitation size, frequency and the like of adjacent flow fields are changed, and the excitation is transmitted to the multilayer variable stiffness unit through the outer flexible skin; in turn, the overall dynamic response of the skin acts on the turbulence coherent structure of the adjacent flow field through the outer flexible skin to control the formation and development processes of the structure, so that the fluid resistance and the flow excitation noise level of the submarine are regulated and controlled. The skin structure can adjust rigidity and damping through the adjustment of a hydraulic system, so that the impedance characteristic of the skin structure is changed, the formation and development of turbulence are affected, and good resistance and noise reduction effects are always kept. In addition, the skin structure has a plurality of adjustable parameters in the aspect of design, the number of layers of the variable stiffness unit and related parameters can be designed and adjusted in a targeted manner according to actual requirements, and the skin structure is simple in structure and easy to manufacture.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An adjustable impedance flexible drag reduction noise reduction skin based on multilayer variable stiffness unit, its characterized in that: comprises an inner flexible substrate (1), an adjustable impedance flexible structure and an outer flexible skin (4); the adjustable impedance flexible structure is composed of a multi-layer variable stiffness unit array arranged between an inner flexible substrate (1) and an outer flexible surface skin (4); the multi-layer variable stiffness unit array is formed by arranging multi-layer variable stiffness units (3), each multi-layer variable stiffness unit (3) comprises three layers of honeycomb structures, and the honeycomb structures of the layers are fixedly connected by adopting a cold bonding technology; the top and the bottom of the multilayer rigidity-changing unit (3) are respectively fixed on the lower surface of the outer flexible surface skin (4) and the upper surface of the inner flexible substrate (1) through a cold bonding technology; the inner flexible substrate (1) is provided with a through hole (2) and is connected with a hydraulic system (8); the outer flexible skin (4) is not in communication with an external flow field;
the adjustable-impedance flexible drag-reduction noise-reduction skin based on the multilayer variable-stiffness units is attached to the outer surface of the submarine shell through an inner flexible substrate (1), and the outer surface of the skin is of a closed structure; when the submarine is not submerged, water is supplied from a water cabin in the submarine, and the inside of the skin is filled with water; when the navigational speed or the navigational depth of the submarine is changed, according to the optimal impedance condition required by skin drag reduction and noise reduction under the navigational speed of the characteristic flow field, the skin is expanded or contracted by regulating and controlling the inflow or outflow of water in the water tank, so that the deformation of each layer of honeycomb structure in the multi-layer variable stiffness unit (3) is regulated and controlled, the stiffness and the damping of the skin are changed, the impedance characteristic of the skin is controlled, and further, the good drag reduction and noise reduction effects are ensured.
2. The adjustable impedance flexible drag reducing noise reducing skin based on a multi-layer variable stiffness unit of claim 1, wherein: the inner flexible substrate (1) and the outer flexible surface (4) are made of flexible and light organic polymer materials.
3. The adjustable impedance flexible drag reducing noise reducing skin based on multilayer variable stiffness unit of claim 1 or 2, wherein: the three layers of honeycomb structures forming the multi-layer variable stiffness unit (3) are different in structural dimension.
4. The adjustable impedance flexible drag reducing noise reducing skin based on multilayer variable stiffness unit of claim 1 or 2, wherein: the multi-layer rigidity-changing unit (3) is made of an organic polymer material with elastic damping characteristics.
5. The adjustable impedance flexible drag reducing noise reducing skin based on multi-layer variable stiffness unit of claim 3, wherein: the multi-layer rigidity-changing unit (3) is made of an organic polymer material with elastic damping characteristics.
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| CN202310332508.0A CN116279967B (en) | 2023-03-31 | 2023-03-31 | Adjustable-impedance flexible drag-reduction noise-reduction skin based on multilayer variable-stiffness units |
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| CN116279967B true CN116279967B (en) | 2024-02-06 |
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| CN117208182B (en) * | 2023-08-08 | 2024-03-08 | 中国船舶集团有限公司第七一九研究所 | Unmanned submarine rudder noise reduction equipment and application method thereof |
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